Collapsible tap or die.



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@Ronny s nonms Pains co.4 immaumo., wnsmNc-Yau D c No. 715,67l. Patented nec. 9.190,2.

P. KnAsTm'. COLLAPSIBLE'TAP 0R DIE.

(Appliation led Jan. 17, 1902.) (NovModeL) 'coLLAPslBLE TAP on ms.

yApplication filed Jan. 1 1, 1802.

(No Moduli,

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No. 715,671. Patnjted uw. 9. |902. P. K BAsTm.

CULLAPSIBLE TAP DR'DIE.

application med Jup. i7, 1902.; (No Model.)

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y MMI e l Uli @sufran STATES PATENT @Tricia PAUL KRASTIN, OF PHILADELPHIA, PENNSYLVANIA.

COLLAPSIBLE TAP OR DIE.

SPECIFICATION forming part of Letters Patent No. 715,671, dated December 9, 1902- Appucanolried January 17, 1902.* serial No. 90,150. (No model.)

To all whom, it 11m/y concern:

Be it known that I, PAUL KRAsr1N,a subject of the Czar of Russia, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented a certain new and'useful Collapsible Tap, of which the following is a specification.

The object of the present invention is to provide a strong, durable, reliable, and comparatively inexpensive collapsible tap, which in operation cuts up to its end and which can be ground and which, if desired, can be adjusted for work of different sizes.

To these and other ends hereinafter set forth the invention comprises the collapsible tap hereinafter described and claimed.

The nature, characteristic features, and scope of the invention will be more fully understood from the following description, taken in connection with the accompanying drawings, forming part hereof, and in which- Figure 1 is a perspective view of the tool arranged as a tap and with a portion removed for the sake of clearness. Fig. 2 is a view drawn to an enlarged scale and illustrating a front view of the tool with portions removed. Figs. 3 and 4: are similar views showing the chasers, respectively, in closed and open positions. Fig. 5 is a transverse central sectional view of the tool. Fig. 6 is a perspective view of the releaser. Fig. '7 is a similar view of one of the chasers/arranged as a tap. Fig. S'is 'aiseciional view illustrating a crank or cam shaft and its connections. Fig. 9 is a perspective view of the chaser-actuator; and Fig. l0 is a sectional View illustrating a modification vof the invention in which the chasers may be adj usted to work of different sizes. l

In the drawings, l is a tubular shank fitted with a head 2, which contains within ita circular recess for the reception of the chaseractuator 3, Fig. 9, and also rectangular ways 4, Fig. 2, for guiding the chasers 5. The chasers 5 are provided with bases which are of generally triangular form, and when the chasers are in open position the outline of their bases is in the general form of a rectangle, and when the chasers are in open position their threaded portions lie, generally speaking, in a circle. Of course the chasers are formed with suitable clearance, and their working parts extend to their very outermost ends, so that they cut up to their ends and so that they can be grou nd like ordinary noneXpansible chasers, or, in other words, they can be as satisfactorily ground as ordinary chasers. to the face of the head, and the chasers project up through asuitable opening in its center. This cap serves to retain the chasers and Chaser-actuator 3 to place while permitting the chasers to slide upon each other within the guides 4 and the Chaser-actuator 3 to be rotated. The Chaser-actuator and the chasers are connected together by slot-andpin connections 7. As shown, only two of the chasers are connected with the chaseractuator, because the movement of these two in the rectangular guides causes similar movements of the other two in the rectangular guides 4 by reason of th'e generally triangular shape of the bases of the chasers. It will be understood that the movement of the chaser-actuator is one of partial rotation, and when it is turned in one direction the chasers are spread apart or opened, and when it is turned in the other direction the chasers are moved together or closed.

8 is a spring-actuated rod, of which the upper end works through a hole in the chaseractuator. This upper end constitutes'a stop which tends to rise between the chasers as soon as they have been opened. This stop by rising between the chasers serves to prevent them from closing or being closed until after its removal, and it also serves to support or take the thrust that is brought to bear upon the chasers when they are at work.

9 is a crank or cam shaft journaled in the head 2. One end of it works in a slot lOin the chaser-actuator and the other end of it is provided with a handle ll and with a spring l2, which is secured to the shank and which tends to turn the crank or cam shaft 9 and the chaserv-actuator 3 into position for closing the chasers. normally close the chasers, and it will always do so unless the stop of the rod 8 holds them open or unless it is overcome by the turning of the handle ll. Of course when the handle is turned to open the chasers the stop of the Thus the spring l2 tends to There is a cap 6, which is applied loo pin 8, since the latter is spring-actuated,in1 mediately rises between the chasers and holds them in open position.

13 is a releaser, which is shown as of circular form and arranged around the chasers. It is connected with the rod 8, and, as shown, this is accomplished by means of rods 14, adjustably connected with a collar 15. The latter is movable up and down on the shank 1 and is connected, by means of a pin 16, with the rod 8. The pin 16 is afforded a range of motion in suitable slots in the shank 1 and the rods 14 work through openings in the head and through elongated slots 17 in the bases of the chasers and through similar slots 18 in the chaser-actuator- Vhen the releaser collides with the work, it pushes the stop on the rod 8 clear of the chasers, and the spring 12, acting through the described connections, immediately closes the chasers, so that the tool can be readily withdrawn from the work.

In applying the tool to the work it is first properly positioned, and then by turning the handle 11 the chasers are brought-into open position in the manner desc1ihed,wliereupon the stop on the rod 8 gets in between them and. holds them in such position. To make the tool adjustable, the stop maybe made tapering, as shown in Fig. l0, and use may be made of a set-screw, as 19, arranged to collide with the collar 15, and thus limit the range of motion of the rod. By properly positioning the setscrew it is obviously possible to change the extent to which the tapered stop penetrates between the chasers and in that way to regulate the extent to which the chasers may close, so that the tool can be adjusted to different sizes ot work. If desired, the rod S may be removed, and one having' a stop ot' differentsize can be used instead of it and in that way the tool can be adjusted to different sizes of work. The threads are shown in Fig. 7 in such a position on the chasers that the tool is adapted to work as a tap.

It will be obvious to those skilled in the art to which the invention relates that modifications may be made in details without departing from the spirit thereof. Hence I do not limit myself to the precise construction and arrangement of parts hereinabove set forth, and illustrated in the accompanying drawings; but,

Having thus described the nature and objects of the invention, what I claim as new, and desire to secure by Letters Patent, is-

1. A collapsible tap comprising a head provided with generally rectangular ways, chasers provided with generally triangular bases, means tending to automatically shift the chasers into closed position, and a stop for projecting between the chasers and locking them in open position, substantially as described.

2. Acollapsibletapordiecomprisingahead provided with generally rectangular Ways, chasers provided with generally triangular bases adapted to said ways, and a stop arranged to project between the chasers and to be withdrawn from such position, substantially as described. y

3. A collapsible tap or die comprising a head having generally rectangular ways, chasers having generally triangular bases, spring-actuated means tending to close the chasers in respect to each other, means for opening the chasers in respect to each other, a spring-controlled stop tending to go between the chasers when in open position, and a releaser and its connections for shifting the stop from such position, substantially as described.

4. Acollapsibletapordiecomprisingahead provided With generally rectangular ways and with a seat and a tubular shank, a chaser-actuator fitted to said seat, chasers having generally triangular shanks iitted to said Ways, slot-and-pin connections between the actuator and chasers, a spring-controlled crank or cam shaft adapted to turn the actuator into position for closing the dies, a handle 'for opening the dies, and a springcontrolled stop tending to go between the chasers when the latter are opened, substantially as described.

5. A collapsible tap or die comprising a head provided with generallyrectangular ways and with a seat and a tubular shank, a Chaser-actuator tted to said seat, chasers having generally triangular shanks fitted to said ways, slot-and-pin connections between the actuator and chasers, a spring-controlled crank or cam shaft adapted to turn the actuator into position for closing the dies, a handle for opening the dies, a spring-controlled stop tending to go between the chasers when the latterare opened, and a releaser arranged to collide with the work and having connection with the stop, substantially as described.

In testimony whereof I have hereunto signed my name.

PAUL KRASTIN.

In presence of- W. J. JACKSON, Jas. A. RICHMOND.

IOO 

